pcmhacking.net

VL400 wrote:Still adding a few things to 11P and playing with the tune. One of the recent things was to try and soften the light throttle shifts and speed up the high load shift. Softening was easy, just change the code/cal so the PCM can use the force motor output for the Toyota accumulator back pressure solenoid. Speeding up the luxury barge gearbox was trickier, other than getting a modified valve body. So added some multi stage torque management code. It now detects the shift and can adjust the timing in 3 stages during the shift. At WOT it has cut over half a second off the shift time. This is a light throttle shift that actually softens things up as the engine loses torque during the shift....

torque.png

The aqua spark advance shows the 3 stages, stage one starts at a configurable time after the shift is commanded by the PCM, it ends when the RPM begins to drop, stage 2 and 3 are also configurable times. Also does fuel and/or spark cut during the middle of the shift in stage 2


And last week decided it was time to get stuck in to the spark. So built up this board that has been sitting waiting for over 2 years

600_6603.JPG

It uses the same filter chip as the festy knock board (which I had been using). I wanted to experiment with knock windowing and variable thresholds/gains with respect to RPM. The board gets the RPM signal from the EST (PCM spark output to the ignition module) and monitors when it goes low to fire the spark plug. Threw some code together for the AVR, and an XDF for making adjustments with this...

XDF.png

Can set the RPM break points to suit the engine, adjust the gain for the sensor, the INT is an integrator time constant, wait is in crank degrees from the EST fall and defines the window start, window is the sample period in crank degrees when the knock module is checking the sensor and threshold is the voltage output of the knock filter chip.

After some changes to the knock settings I think it is working ok. Top monitor is the ECU, RPM in red and knock counts in dark blue. Bottom is the knock module, red is the threshold, green is the sensor output after processing and blue when knock is sent to the PCM ...

ECU and Module.png

Have puled some more spark out and will see how things go tomorrow.

yoda69 wrote:Very cool.
I use Garmin 18x gps sensors at work, these output on serial data using NMEA0183 standard.
Find a way of adding that and you'd have a fairly fully featured track data recorder.
http://static.garmincdn.com/pumac/GPS_1 ... _Specs.pdf
These typically only output at 1hz but some can be setup to 5 Hz, not as good as the Vbox at 100hz, but good enough to map out a track in most cases.

Holden202T wrote:I love the descriptions on the monitor VL400!